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<h1>crc.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef CRYPTOPP_CRC32_H</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_CRC32_H</span>
<a name="l00003"></a>00003 <span class="preprocessor"></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include "<a class="code" href="cryptlib_8h.html">cryptlib.h</a>"</span>
<a name="l00005"></a>00005
<a name="l00006"></a>00006 NAMESPACE_BEGIN(CryptoPP)
<a name="l00007"></a>00007
<a name="l00008"></a>00008 const word32 CRC32_NEGL = 0xffffffffL;
<a name="l00009"></a>00009
<a name="l00010"></a>00010 <span class="preprocessor">#ifdef IS_LITTLE_ENDIAN</span>
<a name="l00011"></a>00011 <span class="preprocessor"></span><span class="preprocessor">#define CRC32_INDEX(c) (c & 0xff)</span>
<a name="l00012"></a>00012 <span class="preprocessor"></span><span class="preprocessor">#define CRC32_SHIFTED(c) (c >> 8)</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define CRC32_INDEX(c) (c >> 24)</span>
<a name="l00015"></a>00015 <span class="preprocessor"></span><span class="preprocessor">#define CRC32_SHIFTED(c) (c << 8)</span>
<a name="l00016"></a>00016 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00017"></a>00017 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00018"></a>00018 <span class="comment">//! CRC Checksum Calculation</span>
<a name="l00019"></a><a class="code" href="class_c_r_c32.html">00019</a> <span class="comment"></span><span class="keyword">class </span><a class="code" href="class_c_r_c32.html" title="CRC Checksum Calculation.">CRC32</a> : <span class="keyword">public</span> <a class="code" href="class_hash_transformation.html" title="interface for hash functions and data processing part of MACs">HashTransformation</a>
<a name="l00020"></a>00020 {
<a name="l00021"></a>00021 <span class="keyword">public</span>:
<a name="l00022"></a>00022 CRYPTOPP_CONSTANT(DIGESTSIZE = 4)
<a name="l00023"></a>00023 <a class="code" href="class_c_r_c32.html" title="CRC Checksum Calculation.">CRC32</a>();
<a name="l00024"></a>00024 <span class="keywordtype">void</span> <a class="code" href="class_c_r_c32.html#abd642abba82cf63edb025461bc1af8c0" title="process more input">Update</a>(<span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> length);
<a name="l00025"></a>00025 <span class="keywordtype">void</span> <a class="code" href="class_c_r_c32.html#ab6f1523fe38d6f1b690888aab1675982" title="truncated version of Final()">TruncatedFinal</a>(byte *hash, <span class="keywordtype">size_t</span> size);
<a name="l00026"></a><a class="code" href="class_c_r_c32.html#ab95565f8b50d25d21cb71e57fad42d23">00026</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_c_r_c32.html#ab95565f8b50d25d21cb71e57fad42d23" title="size of the hash/digest/MAC returned by Final()">DigestSize</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> DIGESTSIZE;}
<a name="l00027"></a>00027 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> * StaticAlgorithmName() {<span class="keywordflow">return</span> <span class="stringliteral">"CRC32"</span>;}
<a name="l00028"></a><a class="code" href="class_c_r_c32.html#ab8f81785058afdb88b1d9567ea36860e">00028</a> std::string <a class="code" href="class_c_r_c32.html#ab8f81785058afdb88b1d9567ea36860e" title="returns name of this algorithm, not universally implemented yet">AlgorithmName</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> StaticAlgorithmName();}
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keywordtype">void</span> UpdateByte(byte b) {m_crc = m_tab[CRC32_INDEX(m_crc) ^ b] ^ CRC32_SHIFTED(m_crc);}
<a name="l00031"></a>00031 byte GetCrcByte(<span class="keywordtype">size_t</span> i)<span class="keyword"> const </span>{<span class="keywordflow">return</span> ((byte *)&(m_crc))[i];}
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keyword">private</span>:
<a name="l00034"></a>00034 <span class="keywordtype">void</span> Reset() {m_crc = CRC32_NEGL;}
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="keyword">static</span> <span class="keyword">const</span> word32 m_tab[256];
<a name="l00037"></a>00037 word32 m_crc;
<a name="l00038"></a>00038 };
<a name="l00039"></a>00039
<a name="l00040"></a>00040 NAMESPACE_END
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="preprocessor">#endif</span>
</pre></div></div>
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